Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 1 | module BSC_MS_ConnectionHandler { |
| 2 | |
Harald Welte | 34b5a95 | 2019-05-27 11:54:11 +0200 | [diff] [blame] | 3 | /* (C) 2017-2019 Harald Welte <laforge@gnumonks.org> |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Released under the terms of GNU General Public License, Version 2 or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 10 | */ |
| 11 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 12 | import from General_Types all; |
| 13 | import from Osmocom_Types all; |
| 14 | import from SCCPasp_Types all; |
| 15 | import from BSSAP_Types all; |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame] | 16 | import from BSSAP_CodecPort all; |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 17 | import from RAN_Emulation all; |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 18 | import from BSSMAP_Templates all; |
| 19 | |
| 20 | import from MobileL3_Types all; |
| 21 | import from MobileL3_CommonIE_Types all; |
| 22 | import from L3_Templates all; |
| 23 | |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 24 | import from MGCP_Types all; |
| 25 | import from MGCP_Templates all; |
| 26 | import from SDP_Types all; |
| 27 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 28 | /* this component represents a single subscriber connection at the MSC. |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 29 | * There is a 1:1 mapping between SCCP connections and RAN_ConnHdlr components. |
| 30 | * We inherit all component variables, ports, functions, ... from RAN_ConnHdlr */ |
| 31 | type component BSC_MS_ConnHdlr extends RAN_ConnHdlr { |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 32 | /* SCCP Connecction Identifier for the underlying SCCP connection */ |
| 33 | var integer g_sccp_conn_id; |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 34 | var MgcpConnectionId g_mgcp_conn_id; |
| 35 | var SDP_Message g_sdp; |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 36 | var BSC_State g_state; |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 37 | } |
| 38 | |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 39 | /* Callback function from general RAN_Emulation whenever a new incoming |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 40 | * SCCP connection arrivces. Must create + start a new component */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame] | 41 | private function CreateCallback(BSSAP_N_CONNECT_ind conn_ind, charstring id) |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 42 | runs on RAN_Emulation_CT return RAN_ConnHdlr { |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 43 | log("Incoming SCCP Connection on BSC ?!?"); |
| 44 | self.stop; |
| 45 | } |
| 46 | |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 47 | /* Callback function from general RAN_Emulation whenever a connectionless |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 48 | * BSSMAP message arrives. Can retunr a PDU_BSSAP that should be sent in return */ |
| 49 | private function UnitdataCallback(PDU_BSSAP bssap) |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 50 | runs on RAN_Emulation_CT return template PDU_BSSAP { |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 51 | var template PDU_BSSAP resp := omit; |
| 52 | |
| 53 | if (match(bssap, tr_BSSMAP_Reset)) { |
| 54 | resp := ts_BSSMAP_ResetAck; |
| 55 | } |
| 56 | |
| 57 | return resp; |
| 58 | } |
| 59 | |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 60 | const RanOps BSC_MS_RanOps := { |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 61 | create_cb := refers(CreateCallback), |
Harald Welte | 0b47606 | 2018-01-21 19:07:32 +0100 | [diff] [blame] | 62 | unitdata_cb := refers(UnitdataCallback), |
| 63 | decode_dtap := false, |
Daniel Willmann | aa17059 | 2018-10-24 18:33:10 +0200 | [diff] [blame] | 64 | role_ms := true, |
Harald Welte | 2fce788 | 2019-04-15 11:48:05 +0200 | [diff] [blame] | 65 | protocol := RAN_PROTOCOL_BSSAP, |
Pau Espin Pedrol | f3c1222 | 2019-05-22 15:18:42 +0200 | [diff] [blame] | 66 | /* Always false. We don't want to enable Osmux signalling in SCCPLite messages: */ |
Pau Espin Pedrol | c6a53db | 2019-05-20 19:31:47 +0200 | [diff] [blame] | 67 | use_osmux := false, |
Daniel Willmann | aa17059 | 2018-10-24 18:33:10 +0200 | [diff] [blame] | 68 | sccp_addr_local := omit, |
| 69 | sccp_addr_peer := omit |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | |
| 73 | function f_gen_cl3(hexstring imsi) return PDU_BSSAP { |
| 74 | var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(imsi)); |
Harald Welte | 6ed6bf9 | 2018-01-24 21:09:15 +0100 | [diff] [blame] | 75 | var PDU_ML3_MS_NW l3 := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, mi)); |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 76 | var BSSMAP_IE_CellIdentifier cell_id := valueof(ts_CellID_LAC_CI(23, 42)); |
| 77 | var PDU_BSSAP bssap := valueof(ts_BSSMAP_ComplL3(cell_id, enc_PDU_ML3_MS_NW(l3))); |
| 78 | return bssap; |
| 79 | } |
| 80 | |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 81 | type enumerated BSC_State { |
| 82 | BSC_STATE_NONE, |
| 83 | BSC_STATE_WAIT_ASS_REQ, |
| 84 | BSC_STATE_WAIT_CRCX, |
| 85 | BSC_STATE_WAIT_MDCX, |
Daniel Willmann | 04541d7 | 2017-11-30 13:14:37 +0100 | [diff] [blame] | 86 | BSC_STATE_WAIT_MDCX2, |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 87 | BSC_STATE_WAIT_CLEAR_CMD, |
| 88 | BSC_STATE_WAIT_DLCX, |
| 89 | BSC_STATE_WAIT_DISC_IND |
| 90 | } |
| 91 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 92 | /* main function processing various incoming events */ |
Pau Espin Pedrol | f3c1222 | 2019-05-22 15:18:42 +0200 | [diff] [blame] | 93 | function main(SCCP_PAR_Address sccp_addr_own, SCCP_PAR_Address sccp_addr_remote, boolean use_osmux) |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 94 | runs on BSC_MS_ConnHdlr { |
| 95 | var PDU_BSSAP bssap; |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 96 | var MgcpCommand mgcp_cmd; |
Pau Espin Pedrol | f3c1222 | 2019-05-22 15:18:42 +0200 | [diff] [blame] | 97 | var template MgcpResponse mgcp_resp; |
| 98 | var MgcpOsmuxCID osmux_cid; |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 99 | |
| 100 | log("Starting main of BSC_MS_ConnHdlr"); |
| 101 | |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 102 | g_mgcp_conn_id := f_mgcp_alloc_conn_id(); |
| 103 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 104 | /* generate and send the Complete Layer3 Info */ |
| 105 | bssap := f_gen_cl3('901770123456789'H); |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 106 | var BSSAP_Conn_Req creq := { |
| 107 | addr_peer := sccp_addr_remote, |
| 108 | addr_own := sccp_addr_own, |
| 109 | bssap := bssap |
| 110 | } |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 111 | g_state := BSC_STATE_WAIT_ASS_REQ; |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 112 | BSSAP.send(creq); |
| 113 | |
| 114 | while (true) { |
| 115 | alt { |
| 116 | /* new SCCP-level connection indication from BSC */ |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 117 | [g_state == BSC_STATE_WAIT_ASS_REQ] BSSAP.receive(tr_BSSMAP_AssignmentReq) -> value bssap { |
Harald Welte | 8f3a962 | 2017-11-25 01:19:13 +0100 | [diff] [blame] | 118 | /* FIXME: Read CIC */ |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 119 | /* respond with ASSIGNMENT COMPL */ |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 120 | g_state := BSC_STATE_WAIT_CRCX; |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 121 | BSSAP.send(ts_BSSMAP_AssignmentComplete(bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode)); |
| 122 | } |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 123 | |
| 124 | /* CRCX -> OK */ |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 125 | [g_state == BSC_STATE_WAIT_CRCX] BSSAP.receive(tr_CRCX) -> value mgcp_cmd { |
Harald Welte | 8f3a962 | 2017-11-25 01:19:13 +0100 | [diff] [blame] | 126 | /* FIXME: proper SDP parameters */ |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 127 | g_sdp := valueof(ts_SDP("127.0.0.1", "127.0.0.1", "foo", "21", 1000, { "98" }, |
| 128 | { valueof(ts_SDP_rtpmap(98, "AMR/8000")), |
| 129 | valueof(ts_SDP_ptime(20)) })); |
| 130 | /* respond with CRCX_ACK */ |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 131 | g_state := BSC_STATE_WAIT_MDCX; |
Pau Espin Pedrol | f3c1222 | 2019-05-22 15:18:42 +0200 | [diff] [blame] | 132 | |
| 133 | if (use_osmux != f_MgcpCmd_contains_par(mgcp_cmd, "X-OSMUX")) { |
| 134 | setverdict(fail, log2str("Received Osmux CID presence doesn't match presence expectancy (", use_osmux, ")")); |
| 135 | self.stop; |
| 136 | } |
| 137 | |
| 138 | if (use_osmux) { |
| 139 | osmux_cid := f_MgcpCmd_extract_osmux_cid(mgcp_cmd); |
| 140 | mgcp_resp := ts_CRCX_ACK_osmux(mgcp_cmd.line.trans_id, g_mgcp_conn_id, osmux_cid, g_sdp); |
| 141 | } else { |
| 142 | mgcp_resp := ts_CRCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp); |
| 143 | } |
| 144 | BSSAP.send(valueof(mgcp_resp)); |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | /* MDCX -> OK */ |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 148 | [g_state == BSC_STATE_WAIT_MDCX] BSSAP.receive(tr_MDCX) -> value mgcp_cmd { |
Harald Welte | 8f3a962 | 2017-11-25 01:19:13 +0100 | [diff] [blame] | 149 | /* FIXME: verify if local part of endpoint name matches CIC */ |
Daniel Willmann | 04541d7 | 2017-11-30 13:14:37 +0100 | [diff] [blame] | 150 | /* respond with MDCX_ACK */ |
| 151 | g_state := BSC_STATE_WAIT_MDCX2; |
| 152 | BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp)); |
| 153 | } |
| 154 | |
| 155 | /* MDCX -> OK */ |
| 156 | [g_state == BSC_STATE_WAIT_MDCX2] BSSAP.receive(tr_MDCX) -> value mgcp_cmd { |
| 157 | /* FIXME: verify if local part of endpoint name matches CIC */ |
| 158 | /* respond with MDCX_ACK */ |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 159 | g_state := BSC_STATE_WAIT_CLEAR_CMD; |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 160 | BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp)); |
| 161 | } |
| 162 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 163 | /* CLEAR COMMAND from MSC; respond with CLEAR COMPLETE) */ |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 164 | [g_state == BSC_STATE_WAIT_CLEAR_CMD] BSSAP.receive(tr_BSSMAP_ClearCommand) -> value bssap { |
| 165 | g_state := BSC_STATE_WAIT_DLCX; |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 166 | BSSAP.send(ts_BSSMAP_ClearComplete); |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 167 | } |
| 168 | |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 169 | /* DLCX -> OK */ |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 170 | [g_state == BSC_STATE_WAIT_DLCX] BSSAP.receive(tr_DLCX) -> value mgcp_cmd { |
Harald Welte | 8f3a962 | 2017-11-25 01:19:13 +0100 | [diff] [blame] | 171 | /* FIXME: verify if local part of endpoint name matches CIC */ |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 172 | g_state := BSC_STATE_WAIT_DISC_IND; |
Harald Welte | c859df5 | 2017-11-24 23:41:41 +0100 | [diff] [blame] | 173 | BSSAP.send(ts_DLCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id)); |
| 174 | } |
| 175 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 176 | [] BSSAP.receive(tr_BSSAP_DTAP) -> value bssap { |
Harald Welte | 8f3a962 | 2017-11-25 01:19:13 +0100 | [diff] [blame] | 177 | /* FIXME: verify if local part of endpoint name matches CIC */ |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 178 | var PDU_ML3_MS_NW l3 := dec_PDU_ML3_MS_NW(bssap.pdu.dtap); |
| 179 | log("Unhandled DTAP ", l3); |
| 180 | } |
| 181 | |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 182 | [g_state == BSC_STATE_WAIT_DISC_IND] BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_IND) { |
Harald Welte | 0a4317a | 2017-11-25 00:32:46 +0100 | [diff] [blame] | 183 | setverdict(pass); |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 184 | self.stop; |
| 185 | } |
| 186 | |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 187 | [] BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND) { |
Daniel Willmann | aa17059 | 2018-10-24 18:33:10 +0200 | [diff] [blame] | 188 | } |
| 189 | |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 190 | /* disconnect in invalid state */ |
Harald Welte | 6811d10 | 2019-04-14 22:23:14 +0200 | [diff] [blame] | 191 | [] BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_IND) { |
Harald Welte | a34e47f | 2017-11-25 01:28:54 +0100 | [diff] [blame] | 192 | setverdict(fail); |
| 193 | self.stop; |
| 194 | } |
| 195 | |
| 196 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 197 | [] BSSAP.receive(PDU_BSSAP:?) -> value bssap { |
| 198 | log("Received unhandled SCCP-CO: ", bssap); |
| 199 | } |
| 200 | } |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | } |